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Fair Value Measurement (Summary Of Changes In Fair Value Of Level 3 Financial Assets And Financial Liabilities Held At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Collateralized Debt Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | $ 4,302 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember | $ 42,801 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember
Realized gains included in earnings | (755)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember | 740 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember
Purchase | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember
Sales | (3,547)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember | (30,975)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember
Settlements | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember | (8,264)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember
Ending Balance | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember | 4,302 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember
The amount of total gains (losses) for period included in earnings attributable to assets still held at December 31 | 0 mcy_AmountOfTotalLossesGainsForPeriodIncludedInEarningsAttributableToAssetsStillHeld / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember | 321 mcy_AmountOfTotalLossesGainsForPeriodIncludedInEarningsAttributableToAssetsStillHeld / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CollateralizedDebtObligationsMember
Partnership Interest in a Private Credit Fund [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 12,548 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember | 11,306 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember
Realized gains included in earnings | (829)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember | 1,242 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember
Purchase | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember
Sales | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember
Settlements | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember
Ending Balance | 11,719 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember | 12,548 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember
The amount of total gains (losses) for period included in earnings attributable to assets still held at December 31 | $ (829)mcy_AmountOfTotalLossesGainsForPeriodIncludedInEarningsAttributableToAssetsStillHeld / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember | $ 1,242 mcy_AmountOfTotalLossesGainsForPeriodIncludedInEarningsAttributableToAssetsStillHeld / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = mcy_PartnershipInterestInPrivateCreditFundMember

X
- Definition Amount of total losses gains for period included in earnings attributable to assets still held + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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